fix(dts-plugin): let dts_plugin handle remote paths instead of abs URLs (#2478)

Co-authored-by: Zack Jackson <[email protected]>
Co-authored-by: Matteo Pietro Dazzi <[email protected]>

Author: 3 people

.changeset/late-numbers-rescue.md

@@ -0,0 +1,5 @@
+---
+'@module-federation/dts-plugin': patch
+---
+
+dts-plugin can now support remotes using relative path references: 'app@/mf-manifest.json'

packages/dts-plugin/src/core/configurations/hostPlugin.test.ts

@@ -118,5 +118,28 @@ describe('hostPlugin', () => {
         },
       });
     });
+
+    it('correctly resolve remotes with relative reference in place of absolute url', () => {
+      const subpathModuleFederationConfig = {
+        ...moduleFederationConfig,
+        remotes: {
+          moduleFederationTypescript: '/subpatha/mf-manifest.json',
+        },
+      };
+
+      const { mapRemotesToDownload } = retrieveHostConfig({
+        moduleFederationConfig: subpathModuleFederationConfig,
+      });
+
+      expect(mapRemotesToDownload).toStrictEqual({
+        moduleFederationTypescript: {
+          alias: 'moduleFederationTypescript',
+          apiTypeUrl: '/subpatha/@mf-types.d.ts',
+          name: '/subpatha/mf-manifest.json',
+          url: '/subpatha/mf-manifest.json',
+          zipUrl: '/subpatha/@mf-types.zip',
+        },
+      });
+    });
   });
 });

packages/dts-plugin/src/core/configurations/hostPlugin.ts

@@ -15,15 +15,15 @@ const defaultOptions = {
 } satisfies Partial<HostOptions>;
 
 const buildZipUrl = (hostOptions: Required<HostOptions>, url: string) => {
-  const remoteUrl = new URL(url);
+  const remoteUrl = new URL(url, 'file:');
 
   const pathnameWithoutEntry = remoteUrl.pathname
     .split('/')
     .slice(0, -1)
     .join('/');
   remoteUrl.pathname = `${pathnameWithoutEntry}/${hostOptions.remoteTypesFolder}.zip`;
 
-  return remoteUrl.href;
+  return remoteUrl.protocol === 'file:' ? remoteUrl.pathname : remoteUrl.href;
 };
 
 const buildApiTypeUrl = (zipUrl?: string) => {